My heater broke down last month, and with the crazy weather we've been having I wasn't sure if we would need it anymore but it looked like we would. I called Guranteed Heating because our neighbor told us that they had done a good job on a house that they rent out in another part of town. We called them. They came promptly, on time, and had a diagnosis in no time. They came back the next day with the parts they needed to replace, and everything was done by the end of the day..they are great.
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